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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1daf42f7d7a971ecd65d3135a903c327153f6d97295104ef40e240c1b184bd02' 
  AND token = 'wiV+qWQQI0pa4bU/UoNKYSG3RjDxe7q04PDPD+/qgj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}